but neither appear to make any difference. Just to be clear: I've tried identifying these tags with Firefox and adjusting padding etc, before I posted on the forum. Problem is, I can't get anything to work.

Hi there, when you look in firebug scroll through the list you'll see there's a yellow margin highlighted on the screen relating to the .post meta section. I've pasted the code in below, simply adjust that figure in the margin bottom to reduce the space.